Package for compounding rubber and compounded rubber
AssigneeThe Goodyear Tire & Rubber Company
InventorBharat K. Kansupada
Life of this patent
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Abstract
A package comprised of at least one compounding ingredient for unvulcanized rubber contained in a protective film of a thermoplastic polycaprolactone. The invention further relates to a compounded rubber comprised of a mixture of unsaturated rubber and a package of compounding ingredients contained in the polycaprolactone film. For such purposes, the polycaprolactone film can be in the form of a bag thereof.
Claims5
A compounded rubber comprised of a mixture of unsaturated rubber and a package which comprises (A) compounding ingredients for unvulcanized rubber packaged in (B) a protective film having a thickness in the range of about 0.02 to about 0.08 mm consisting essentially of a thermoplastic polycaprolactone containing an anti-block agent and further characterized by a melting point in the range of about 60.degree. C. to about 70.degree. C., a melt flow index at 190.degree. C. and about 440 psi of about 5 to about 7 g/min, and a molecular weight (number average) in a range of about 70,000 to about 90,000.
A compounded rubber prepared by the steps of (A) blending an unvulcanized unsaturated diene-based elastomer and rubber compounding ingredients therefor, exclusive of sulfur and sulfur cure accelerators for rubber, in at least one non-productive mixing stage to form a non-productive blend;
- and (B) in a subsequent, productive mixing stage, blending at least one package which comprises (i) sulfur and sulfur cure accelerator(s) for rubber packaged in (ii) a protective film having a thickness in the range of about 0.02 to about 0.08 mm consisting essentially of a thermoplastic polycaprolactone containing an anti-block agent and further characterized by a melting point in the range of about 60.degree. C. to about 70.degree. C., a melt flow index at 190.degree. C. and about 440 psi of about 5 to about 7 g/min, and a molecular weight (number average) in a range of about 70,000 to about 90,000.
Dependencies are inferred from the claim text.